The Catastrophic Quaken can smash into the ground and create huge shockwaves that can knock dragons out of air.
As a boulder class dragon, the Catastrophic Quaken literally is what it eats - as it enjoys the consumption of rocks. This dietary preference is the cause for its tendency to reside in rocky terrain where it can roam afoot and pick up sustenance as it travels. Strong and hulking, this dragon relies on its size as the ultimate defense mechanism. When threatened, its immediate reaction is to enter protective mode and roll into a ball like a giant armadillo. Once secured into this position, it quickly takes the offense, smashing the ground to create shockwaves so powerful they will knock other dragons down whether they are on land or airborne. A lack of human interaction has made these dragons cautionary over time, but since Hiccup and the Dragon Riders have introduced them to humans they are slowly becoming less stony and more caring.
See more of Catastrophic Quaken in:
Dragons: Race to the Edge
The bully of the dragon world but prone to loneliness
Magma slobber from trifurcated jaws
The Catastrophic Quaken has a trifold jaw. When fully unhinged, it can ingest a plethora of rocks, which it subsequently spews out in the form of a molten lava stream.